Power supply adapter



FIG. 1 is a perspective view showing the back, bottom and left side of apower supply adapter of my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for a power supply adapter, as shown anddescribed.